Time-of-check Time-of-use (TOCTOU) Race Condition in Flysystem - CVE-2021-32708
Published: June 28, 2021
Vulnerability identifier: #VU54411
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-32708
CWE-ID: CWE-367
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a race condition. A remote attacker can send a specially crafted request and execute arbitrary code on the target system.
Affected software
Flysystem
Fedora
php-league-flysystem
Fedora
php-league-flysystem
How to mitigate CVE-2021-32708
Install updates from vendor's website.
Flysystem - addressed in versions 1.1.4, 2.1.1
php-league-flysystem - addressed in versions 1.1.4-1.fc33, 1.1.4-1.fc34
php-league-flysystem - addressed in versions 1.1.4-1.fc33, 1.1.4-1.fc34
External References
- https://github.com/thephpleague/flysystem/commit/f3ad69181b8afed2c9edf7be5a2918144ff4ea32
- https://github.com/thephpleague/flysystem/commit/a3c694de9f7e844b76f9d1b61296ebf6e8d89d74
- https://github.com/thephpleague/flysystem/security/advisories/GHSA-9f46-5r25-5wfm
- https://packagist.org/packages/league/flysystem